On a hot summer weekend, Stinson’s 3.5-mile stretch of sand teems with sunbathers lounging amid the lifeguard stands, offering up the most ‘Southern California’ vibe of the Marin beaches. Waves here can be substantial, offering surfers and swimmers ample activity—though be warned, a wetsuit may be in order for longer dips. Showers and bathrooms are available, as well as a stretch of green beyond the dunes for grilling and tossing a football. After a long day, salty bodies can be found lining up outside the Parkside Snack Bar, which offers up burgers, smoothies, and soft serve cones. No shirt, no shoes, no problem.